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#'s 18 and 19. Not the intake manifold runner - I was thinking the same thing and got rather confused.
Implausible signal typically means electrical issues Mike.
Check the harness as well, especially and grounding points/tracks.
Hello, I'm reading through this thread as I think I have the same problem but I am having a little trouble understanding the system based on the discussion. Per the diagram it looks like there is one motor with a single linkage connection that controls what? An intake flap? Then there is another motor that connects to two other linkages, each fitted with feedback potentiometers. What are they?
I need to get the codes off mine, but I'm first trying to understand how this system operates so I don't just shotgun parts at it until it worky.
What should I see with engine static vs. just starting up? When I start the engine cold it runs poorly (sometimes) almost like it's missing or has vacuum leak, then smoothes out. Check engine light used to come on intermittently, then clear itself. Now on steady with no ability to clear (immediately comes back). Like I said I need to get the codes.
Hello, I'm reading through this thread as I think I have the same problem but I am having a little trouble understanding the system based on the discussion. Per the diagram it looks like there is one motor with a single linkage connection that controls what? An intake flap? Then there is another motor that connects to two other linkages, each fitted with feedback potentiometers. What are they?
I need to get the codes off mine, but I'm first trying to understand how this system operates so I don't just shotgun parts at it until it worky.
What should I see with engine static vs. just starting up? When I start the engine cold it runs poorly (sometimes) almost like it's missing or has vacuum leak, then smoothes out. Check engine light used to come on intermittently, then clear itself. Now on steady with no ability to clear (immediately comes back). Like I said I need to get the codes.
Back up a step or two. First, per sticky, which motor do you have? What year? Much of this thread went in direction of FSI 4.2 IIRC. If port 4.2 (or and S8 or W12, or for non-North America some others) can be different or sometimes not even applicable. Need some basics so folks don't make mistaken assumptions. Best to include them in your avatar or signature, but at least the thread post if not.
Back up a step or two. First, per sticky, which motor do you have? What year? Much of this thread went in direction of FSI 4.2 IIRC. If port 4.2 (or and S8 or W12, or for non-North America some others) can be different or sometimes not even applicable. Need some basics so folks don't make mistaken assumptions. Best to include them in your avatar or signature, but at least the thread post if not.
My apologies. Sticky? I reread my post but didn't catch that. By static I mean engine not running and the related position of links. I will add the proper info to my profile once on a laptop.
I have the 4.2 FSI.
I found one of the linkages popped off. Needless to say won't be going back to that shop. Explains why maybe didn't reset. Still think I have a problem though. Watched electric motor on engine position linkages after startup. Not sure though what I'm looking at. When I can send a pic I will. Thanks.
My apologies. Sticky? I reread my post but didn't catch that. By static I mean engine not running and the related position of links. I will add the proper info to my profile once on a laptop.
I have the 4.2 FSI.
I found one of the linkages popped off. Needless to say won't be going back to that shop. Explains why maybe didn't reset. Still think I have a problem though. Watched electric motor on engine position linkages after startup. Not sure though what I'm looking at. When I can send a pic I will. Thanks.
Thanks. Sticky = permanent post at very top of p. 1 of AW D3 board screen.
So on follow up I don't have much to add, but good you found the link issue. Will definitely help overall performance feel. One pointer and tip--watch the replies (or info in searches). From the diagram and discussion of electric motors below, I think the design changed somewhat from the port motor used earlier, and then the FSI motor. Most posts (and experience) on this subject seem to be with the port motor; this is one of the few threads I remember that ended up w/ FSI discussion. You can also find FSI in C6 A6 4.2's and Q7 4.2's. Probably a fair number more of them than D3 4.2 FSI's if you do some searching for issues, description, etc. My A6 4.2 was port era, so the older one.
Page below is basic description from the 4.2 FSI SSP publication. IIRC correctly the old port 4.2 SSP had more on it, but might help you get up to speed on theory of it. The discussion is about Q7, but should apply to your FSI A8. If it mentions RS4, that is the "other" higher performance and higher strung variant found there and in R8's.
Back up a step or two. First, per sticky, which motor do you have? What year? Much of this thread went in direction of FSI 4.2 IIRC. If port 4.2 (or and S8 or W12, or for non-North America some others) can be different or sometimes not even applicable. Need some basics so folks don't make mistaken assumptions. Best to include them in your avatar or signature, but at least the thread post if not.
This was perfect. Huge help thanks. I'm thinking I will clear the fault and run it. Check for any binding on intake flaps and possibly end up replacing the motor or testing it on a bench if problem persists. Again thank you! Where do you guys get this info?!
I have a 2009 Audi A8 L 4.2 FSI I had a constant misfire on cylinder 5 so I took the intake manifold off and mistakenly unhooked the upper arm on the intake. Now I cant get the motor to move to reattach. I was hoping to get this link back on before reinstalling the intake. Any advice would be appreciated.
08-03-2016, 04:27 AM
